《航海王電影：Z》（ONE PIECE FILM Z，日文：ワンピース フィルム ゼット）**是《航海王》系列第十二部劇場版動畫，也是公認最具代表性與評價最高的劇場版之一。電影於2012年12月15日在日本上映，台灣則於2013年1月25日正式上映。本作最大的特色，在於由《ONE PIECE》原作者尾田榮一郎親自擔任總合製作人，深度參與角色設計、世界觀設定與劇情監修，因此被許多粉絲視為最接近漫畫原作精神的劇場版作品。

本片由長峯達也擔任導演，劇本由鈴木收負責，音樂則由田中公平創作。配音陣容維持動畫版原班人馬，包括魯夫的田中真弓、索隆的中井和哉、娜美的岡村明美、騙人布的山口勝平、香吉士的平田廣明、喬巴的大谷育江、羅賓的山口由里子、佛朗基的矢尾一樹以及布魯克的長等。此外，本片最大的亮點人物「Z」則由資深聲優大塚芳忠擔任配音，而日本知名演員篠原涼子與香川照之則分別替新海軍的重要成員艾茵與賓茲獻聲。

故事背景發生在草帽海賊團進入新世界之後。魯夫一行人在海上救起一名身受重傷的神祕男子，這名男子擁有裝備著巨大海樓石機械手臂的右手。海樓石能夠封印惡魔果實能力，因此能力者只要遭到碰觸便會失去戰鬥能力。然而，當男子得知救命恩人竟然是海賊後，立刻毫不留情展開猛烈攻擊，使草帽海賊團陷入苦戰，千陽號也遭受重創。

這名男子正是曾經受到無數海軍尊敬的前海軍上將「Z」。他原本是海軍中的傳奇人物，不但培養出許多優秀軍官，也深受部下敬重。然而，一場悲劇改變了他的人生。家人遭海賊殺害、學生遭到屠殺，加上政府對犯下罪行的海賊採取姑息態度，使他逐漸對整個海賊世界徹底絕望。他認為只要海賊存在，世界便永遠不可能獲得真正的和平，因此脫離海軍，自行成立了「新海軍」，決心消滅所有海賊，甚至不惜犧牲整個新世界。

為了實現理想，Z奪取了被稱為「原動石（Dyna Stones）」的超級能源礦石。原動石擁有堪比古代兵器的破壞力，他計畫引爆新世界的重要火山群，利用連鎖爆炸徹底毀滅整片新世界海域，讓所有海賊與島嶼一同消失。這個計畫雖然能終結大海賊時代，但也將造成數百萬無辜民眾喪命，因此海軍本部不得不全力阻止，而魯夫等人也決定挺身而出，與新海軍展開最終決戰。

電影除了草帽海賊團之外，也集結了海軍本部的重要人物。海軍元帥薩卡斯基（赤犬）下令追捕Z，而前海軍上將青雉則以自由身分暗中追查昔日恩師，希望能阻止老師繼續走向毀滅。青雉與Z之間亦師亦友的情感，以及魯夫對於自由與夢想的信念，形成整部電影最重要的精神衝突。

與過去劇場版不同，《航海王電影：Z》並非單純描寫正邪對決，而是深入探討「正義究竟是什麼」。Z並非天生邪惡，他曾經是最值得尊敬的海軍英雄，只是在接連失去摯愛與信念後，逐漸走向極端。他希望創造沒有海賊的新世界，但所採取的方法卻必須犧牲無數無辜生命，因此魯夫即使理解他的痛苦，也不得不阻止他的計畫。電影最後，Z選擇以海軍英雄的身分迎向自己的終點，也讓不少觀眾留下深刻印象。

在製作方面，本片是《航海王》當時投入規模最大的劇場版之一，戰鬥場面全面升級，包含魯夫四檔登場前最成熟的二檔、三檔運用，以及索隆、香吉士等人的高品質戰鬥動畫，都獲得觀眾高度評價。片中的最終決戰節奏緊湊、演出震撼，加上田中公平充滿史詩感的配樂，使電影具有極高的戲劇張力。

票房方面，《航海王電影：Z》創下當時系列最高票房紀錄，日本最終票房約68.7億日圓，不僅打破歷代《航海王》劇場版紀錄，也成為2012年至2013年間最成功的日本動畫電影之一。在海外市場同樣受到歡迎，亞洲多個地區上映後均取得亮眼成績，進一步提升《ONE PIECE》劇場版的國際影響力。

市場評價方面，《航海王電影：Z》普遍獲得極高肯定，許多影迷至今仍將它與後來的《航海王電影：GOLD》、《航海王電影：STAMPEDE》以及《ONE PIECE FILM RED》並列為系列最經典的劇場版。其中又以Z這名反派角色最受讚譽，許多評論認為他是《航海王》電影史上塑造最成功、最具悲劇色彩的反派人物之一。他不像典型反派追求權力或財富，而是以扭曲的正義作為行動理念，讓觀眾在同情與反對之間產生複雜情感。

整體而言，《航海王電影：Z》不僅是一部娛樂性極高的熱血動畫，更透過Z與魯夫截然不同的信念，探討正義、復仇、犧牲與自由等核心主題。無論是劇情深度、角色塑造、動作場面、音樂表現還是情感張力，都被視為《航海王》劇場版的巔峰之作，也是許多粉絲最推薦的新觀眾入門電影之一。

ONE PIECE FILM Z (Japanese: ワンピース フィルム ゼット), released internationally as One Piece Film: Z, is the twelfth theatrical film based on Eiichiro Oda's world-famous manga and anime series ONE PIECE. It premiered in Japan on December 15, 2012, and was released in Taiwan on January 25, 2013. Widely regarded as one of the greatest entries in the franchise, the film was produced with extensive involvement from the original creator, Eiichiro Oda, who served as Executive Producer and supervised the story, character designs, and overall production. His direct participation gave the movie a stronger connection to the original manga than previous theatrical releases.

The film was directed by Tatsuya Nagamine, written by Osamu Suzuki, and features music composed by Kohei Tanaka, whose orchestral soundtrack enhances the emotional weight of the story. The original Japanese voice cast from the television series returned, including Mayumi Tanaka as Monkey D. Luffy, Kazuya Nakai as Roronoa Zoro, Akemi Okamura as Nami, Kappei Yamaguchi as Usopp, Hiroaki Hirata as Sanji, Ikue Otani as Tony Tony Chopper, Yuriko Yamaguchi as Nico Robin, Kazuki Yao as Franky, and Cho as Brook. The film's central antagonist, Zephyr, better known as "Z," was voiced by veteran actor Hochu Otsuka, while acclaimed Japanese actors Ryoko Shinohara and Teruyuki Kagawa voiced his loyal followers Ain and Binz.

The story takes place after the Straw Hat Pirates have entered the New World. During their voyage, they rescue a severely injured but mysterious man whose right arm has been replaced by a gigantic mechanical weapon made from Seastone, a rare mineral capable of nullifying Devil Fruit abilities. However, once the man realizes that his rescuers are pirates, he immediately attacks them without hesitation. Despite fighting back, the Straw Hat Pirates are overwhelmed by the powerful stranger and his mysterious organization. Their ship, the Thousand Sunny, suffers extensive damage, while several crew members are affected by the unique abilities of Z's subordinates.

The mysterious warrior is revealed to be Zephyr, a former Marine Admiral and legendary military instructor who was once respected throughout the Marines. After suffering a series of personal tragedies—including the murder of his family by pirates and the deaths of his beloved students—Zephyr gradually lost faith in both justice and the World Government. Believing that pirates are the root of all suffering, he abandoned the Marines and established his own independent force known as the Neo Marines. His ultimate goal is nothing less than the complete eradication of every pirate in the world.

To achieve this objective, Z steals a collection of devastating energy sources known as the Dyna Stones, minerals said to possess destructive power comparable to the Ancient Weapons. His plan is to trigger massive volcanic eruptions across the New World, causing a chain reaction that would annihilate every pirate, island, and civilization within the region. Although his plan could potentially end the Great Pirate Era forever, it would also kill countless innocent civilians. As a result, both the Marines and the Straw Hat Pirates are forced to confront him in order to prevent an unprecedented global catastrophe.

The conflict becomes even more complex with the appearance of Kuzan (Aokiji), the former Marine Admiral and Zephyr's former student. Having left the Marines after losing the battle for the Fleet Admiral position, Kuzan pursues his former mentor in the hope of stopping him before he completely loses himself. The relationship between teacher and student adds emotional depth to the story, while Luffy's unwavering belief in freedom directly clashes with Z's belief that absolute justice can only be achieved through total destruction.

Unlike many previous One Piece films, ONE PIECE FILM Z presents a morally complex antagonist rather than a straightforward villain. Zephyr is not driven by greed or ambition; instead, he is motivated by overwhelming grief, disappointment, and an uncompromising sense of justice. His tragic past makes him one of the franchise's most sympathetic antagonists, forcing audiences to question whether noble intentions can ever justify catastrophic actions. The emotional climax of the film, in which Z chooses to face his destiny with dignity as a Marine, remains one of the most memorable endings in the entire One Piece film series.

From a production standpoint, the movie represented a significant leap in animation quality for the franchise. The action choreography is fast-paced and cinematic, with large-scale battles featuring Luffy, Zoro, Sanji, and the rest of the Straw Hat Pirates. The final confrontation between Luffy and Z is especially praised for its emotional intensity, fluid animation, and powerful musical score, making it one of the most celebrated fights in any One Piece movie.

Commercially, ONE PIECE FILM Z was a tremendous success. It earned approximately 6.87 billion yen at the Japanese box office, making it the highest-grossing One Piece film at the time of its release. The movie also performed strongly across Asian markets and significantly expanded the international popularity of the franchise's theatrical releases.

Critical reception was overwhelmingly positive. Both critics and longtime fans praised the film for its mature storytelling, exceptional animation, emotional character development, and memorable soundtrack. Zephyr is frequently considered one of the greatest antagonists in the history of the One Piece franchise due to his believable motivations and tragic character arc. Even years after its release, ONE PIECE FILM Z is commonly ranked alongside ONE PIECE FILM RED, ONE PIECE STAMPEDE, and ONE PIECE FILM GOLD as one of the finest theatrical adaptations of Eiichiro Oda's beloved series.

Overall, ONE PIECE FILM Z is far more than a traditional action-adventure anime film. It explores profound themes of justice, revenge, sacrifice, redemption, and freedom while delivering spectacular battles and emotional storytelling. Thanks to its compelling narrative, unforgettable villain, outstanding production values, and lasting emotional impact, it is widely regarded as one of the definitive masterpieces of the One Piece film franchise.